package com.staryet.baas.object.dao.impl.mongo;

import com.mongodb.*;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.env.Environment;
import org.springframework.data.mapping.model.FieldNamingStrategy;

import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.List;

/**
 * Created by Codi on 15/10/1.
 */
@Configuration
@ConfigurationProperties(prefix = "spring.data.mongodb")
public class MongoProperties {

    /**
     * Default port used when the configured port is {@code null}.
     */
    public static final int DEFAULT_PORT = 27017;

    /**
     * Mongo server host.
     */
    private String host;

    /**
     * Mongo server port.
     */
    private Integer port = null;

    /**
     * Mongo database URI. When set, host and port are ignored.
     */
    private String uri = "mongodb://localhost/test";

    /**
     * Database name.
     */
    private String database;

    /**
     * Authentication database name.
     */
    private String authenticationDatabase;

    /**
     * GridFS database name.
     */
    private String gridFsDatabase;

    /**
     * Login user of the mongo server.
     */
    private String username;

    /**
     * Login password of the mongo server.
     */
    private char[] password;

    /**
     * Fully qualified name of the FieldNamingStrategy to use.
     */
    private Class<? extends FieldNamingStrategy> fieldNamingStrategy;

    public String getHost() {
        return this.host;
    }

    public void setHost(String host) {
        this.host = host;
    }

    public String getDatabase() {
        return this.database;
    }

    public void setDatabase(String database) {
        this.database = database;
    }

    public String getAuthenticationDatabase() {
        return this.authenticationDatabase;
    }

    public void setAuthenticationDatabase(String authenticationDatabase) {
        this.authenticationDatabase = authenticationDatabase;
    }

    public String getUsername() {
        return this.username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public char[] getPassword() {
        return this.password;
    }

    public void setPassword(char[] password) {
        this.password = password;
    }

    public Class<? extends FieldNamingStrategy> getFieldNamingStrategy() {
        return this.fieldNamingStrategy;
    }

    public void setFieldNamingStrategy(
            Class<? extends FieldNamingStrategy> fieldNamingStrategy) {
        this.fieldNamingStrategy = fieldNamingStrategy;
    }

    public void clearPassword() {
        if (this.password == null) {
            return;
        }
        for (int i = 0; i < this.password.length; i++) {
            this.password[i] = 0;
        }
    }

    public String getUri() {
        return this.uri;
    }

    public void setUri(String uri) {
        this.uri = uri;
    }

    public Integer getPort() {
        return this.port;
    }

    public void setPort(Integer port) {
        this.port = port;
    }

    public String getGridFsDatabase() {
        return this.gridFsDatabase;
    }

    public void setGridFsDatabase(String gridFsDatabase) {
        this.gridFsDatabase = gridFsDatabase;
    }

    public String getMongoClientDatabase() {
        if (this.database != null) {
            return this.database;
        }
        return new MongoClientURI(this.uri).getDatabase();
    }

    /**
     * Creates a {@link MongoClient} using the given {@code options}
     *
     * @param options the options
     * @return the Mongo client
     * @throws UnknownHostException if the configured host is unknown
     * @deprecated Since 1.3.0 in favour of
     * {@link #createMongoClient(MongoClientOptions, Environment)}
     */
    @Deprecated
    public MongoClient createMongoClient(MongoClientOptions options)
            throws UnknownHostException {
        return this.createMongoClient(options, null);
    }

    /**
     * Creates a {@link MongoClient} using the given {@code options} and
     * {@code environment}. If the configured port is zero, the value of the
     * {@code local.mongo.port} property retrieved from the {@code environment} is used
     * to configure the client.
     *
     * @param options     the options
     * @param environment the environment
     * @return the Mongo client
     * @throws UnknownHostException if the configured host is unknown
     */
    public MongoClient createMongoClient(MongoClientOptions options,
                                         Environment environment) throws UnknownHostException {
        try {
            if (hasCustomAddress() || hasCustomCredentials()) {
                if (options == null) {
                    options = MongoClientOptions.builder().build();
                }
                List<MongoCredential> credentials = null;
                if (hasCustomCredentials()) {
                    String database = this.authenticationDatabase == null ? getMongoClientDatabase()
                            : this.authenticationDatabase;
                    credentials = Arrays.asList(MongoCredential.createScramSha1Credential(
                            this.username, database, this.password));
                }
                String host = this.host == null ? "localhost" : this.host;
                int port = determinePort(environment);
                return new MongoClient(Arrays.asList(new ServerAddress(host, port)),
                        credentials, options);
            }
            // The options and credentials are in the URI
            return new MongoClient(new MongoClientURI(this.uri, builder(options)));
        } finally {
            clearPassword();
        }
    }

    private boolean hasCustomAddress() {
        return this.host != null || this.port != null;
    }

    private boolean hasCustomCredentials() {
        return this.username != null && this.password != null;
    }

    private int determinePort(Environment environment) {
        if (this.port == null) {
            return DEFAULT_PORT;
        }
        if (this.port == 0) {
            if (environment != null) {
                String localPort = environment.getProperty("local.mongo.port");
                if (localPort != null) {
                    return Integer.valueOf(localPort);
                }
            }
            throw new IllegalStateException(
                    "spring.data.mongodb.port=0 and no local mongo port configuration "
                            + "is available");
        }
        return this.port;
    }

    private MongoClientOptions.Builder builder(MongoClientOptions options) {
        MongoClientOptions.Builder builder = MongoClientOptions.builder();
        if (options != null) {
            builder.alwaysUseMBeans(options.isAlwaysUseMBeans());
            builder.connectionsPerHost(options.getConnectionsPerHost());
            builder.connectTimeout(options.getConnectTimeout());
            builder.cursorFinalizerEnabled(options.isCursorFinalizerEnabled());
            builder.dbDecoderFactory(options.getDbDecoderFactory());
            builder.dbEncoderFactory(options.getDbEncoderFactory());
            builder.description(options.getDescription());
            builder.maxWaitTime(options.getMaxWaitTime());
            builder.readPreference(options.getReadPreference());
            builder.socketFactory(options.getSocketFactory());
            builder.socketKeepAlive(options.isSocketKeepAlive());
            builder.socketTimeout(options.getSocketTimeout());
            builder.threadsAllowedToBlockForConnectionMultiplier(options
                    .getThreadsAllowedToBlockForConnectionMultiplier());
            builder.writeConcern(options.getWriteConcern());
        }
        return builder;
    }

}
